Shooting my Mechtech Glock 40 S&W Carbine today I had a case separation.
Another round loaded into the separated case in the chamber when the bolt cycled.
The Mechtech suffered no damage from what I could tell.
It functioned and cycled fine after the separation.
It was probably an overcharged reload that did it.
That's a first for me.
Mechtech & Charter Arms 40 S&W Revolver